package com.gxlevi.facade;

public class Light {
    private Light() {
    }

    private static Light instance = new Light();

    public static Light getInstance() {
        return instance;
    }

    public void on() {
        System.out.println("light on");
    }

    public void off() {
        System.out.println("light off");
    }

    public void up() {
        System.out.println("light up");
    }

    public void down() {
        System.out.println("light down");
    }
}
